Push pin head



FIG. 1 is a perspective view of a push pin head, showing our new design;

FIG. 2 is an elevational side view of the push pin head, all other elevational side views being identical;

FIG. 3 is a view of the shaft end of the push pin head; and,

FIG. 4 is a veiw of the end of the push pin head opposite the shaft end.

The broken lines in the Figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a push pin head, as shown and described. 